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      <title>RabbitMQ延时插件 - 交互式测验</title>
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      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>RabbitMQ延时插件 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
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                    <div class="progress-bar">
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      <script>
        const quizData = [
  {
    "question": "根据文档，延迟队列（Delayed Queue）的核心作用是什么？",
    "options": [
      "存储处理失败的消息，以便进行手动重试。",
      "立即将消息广播给所有订阅的消费者。",
      "存储消息并在指定的延迟时间到达后，才将其投递给消费者。",
      "作为消息的临时备份，防止主队列数据丢失。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "延迟队列是一种特殊的消息队列，它的核心功能是存储那些被设定了延迟时间的消息。与普通队列的立即投递不同，延迟队列会等到消息的延迟时间结束后，才将消息推送给消费者进行处理，从而实现延迟任务的效果。",
    "source": "文档中「延迟消息和延迟队列」部分",
    "hint": "思考一下“延迟”二字的含义。这种队列的设计目的不是为了立即处理，也不是为了处理失败，而是为了在未来的某个时间点进行处理。"
  },
  {
    "question": "在配置RabbitMQ延时交换机（Delayed Exchange）时，必须在参数中指定一个关键的'argument'，它是什么，作用又是什么？",
    "options": [
      "指定 `x-dead-letter-exchange`，用于在消息延迟失败后进行死信处理。",
      "指定 `x-delayed-type`，用于定义延迟结束后消息将按照哪种交换机类型（如'direct'）进行路由。",
      "指定 `x-message-ttl`，用于为所有进入该交换机的消息设置一个统一的延迟时间。",
      "指定 `x-max-length`，用于限制延迟队列中可以存储的最大消息数量。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "配置延时交换机时，其本身类型被定义为'x-delayed-message'。但为了在延迟结束后能正确地将消息路由到队列，必须通过`x-delayed-type`参数来指定其内部的路由行为，例如'direct'、'topic'或'fanout'。这个参数决定了消息延迟后的路由逻辑。",
    "source": "文档中「延时插件的配置 -> 1. 定义延时交换机和队列」部分",
    "hint": "在文档的Java配置代码示例中，创建 `CustomExchange` 时，`args.put` 方法放入了一个关键的键值对。这个键是什么？"
  },
  {
    "question": "当生产者需要发送一条希望在5秒后被消费的消息时，应该如何通过代码实现？",
    "options": [
      "将消息发送到一个名称包含'delay_5000'的特定队列。",
      "在发送消息时，为消息添加一个名为'x-delay'且值为5000的header。",
      "在调用发送方法时，通过`MessagePostProcessor`设置消息属性的`setDelay(5000)`。",
      "在发送消息前，调用`Thread.sleep(5000)`来暂停生产者线程。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "延时插件要求在发送消息时，动态地为每条消息设置延迟时间。这通常通过`MessagePostProcessor`回调函数来实现，在其中调用`message.getMessageProperties().setDelay()`方法，并传入以毫秒为单位的延迟时间。",
    "source": "文档中「延时插件的配置 -> 2. 配置消息的延时属性」部分",
    "hint": "文档中的代码示例展示了如何发送消息，并特别提到了一个用于后处理消息的接口（`MessagePostProcessor`）。"
  },
  {
    "question": "根据文档描述，启用RabbitMQ延时插件的正确命令行指令是什么？",
    "options": [
      "rabbitmqctl enable_plugin rabbitmq_delayed_message_exchange",
      "rabbitmq-server start --plugin rabbitmq_delayed_message_exchange",
      "rabbitmq-plugins install rabbitmq_delayed_message_exchange",
      "rabbitmq-plugins enable rabbitmq_delayed_message_exchange"
    ],
    "correctAnswerIndex": 3,
    "explanation": "文档中明确指出，在将插件文件复制到指定目录后，需要使用RabbitMQ的管理工具来启用它。正确的命令是`rabbitmq-plugins enable`，后面跟上插件的名称`rabbitmq_delayed_message_exchange`。",
    "source": "文档中「延迟插件的安装 -> 5. 启用插件」部分",
    "hint": "启用插件的命令通常使用 `rabbitmq-plugins` 这个工具，并结合一个表示“启用”的动词。"
  },
  {
    "question": "文档中提到了使用延时插件可能带来的性能影响，以下哪一项是其描述的潜在成本？",
    "options": [
      "显著增加了消费者的代码复杂度。",
      "导致RabbitMQ服务器的存储和处理成本增加，尤其是在有大量延时消息时。",
      "消费者必须使用推（push）模式，无法使用拉（pull）模式。",
      "延时消息无法与事务性消息一起使用。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档在“延时插件的性能和特点”部分明确指出，由于延时消息需要在RabbitMQ中存储一段时间直到延迟到期，这会增加服务器的存储负担和CPU处理成本，特别是在处理海量延时消息的场景下，性能影响需要被仔细评估。",
    "source": "文档中「延时插件的性能和特点 -> 消息发送性能特点」部分",
    "hint": "考虑一下，消息在被消费前需要在服务器上“等待”，这个“等待”过程会对服务器的哪些资源产生消耗？"
  },
  {
    "question": "在“订单超时自动取消”的应用场景中，当订单创建时，一条包含订单信息的消息被发送到延时交换机。接下来会发生什么？",
    "options": [
      "消息会立即被一个专门的“超时处理器”消费，该处理器内部有一个计时器。",
      "消息会停留在延时交换机中，直到设置的超时时间（如30分钟）到达，然后才被路由到指定的处理队列（如order-timeout-queue）。",
      "RabbitMQ服务器会立即返回一个错误，因为订单处理不应该被延迟。",
      "该消息会被立即投递到死信队列，等待超时后被重新处理。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "这个场景是延时插件的典型应用。订单消息在发送时被设置了一个延迟时间（例如30分钟）。在这段时间内，消息由延时插件管理并暂存。当延迟时间一到，插件就会将该消息路由到下一个正常的队列，此时监听该队列的消费者（OrderTimeoutHandler）才会接收到消息并执行取消订单的逻辑。",
    "source": "文档中「延时插件的使用场景」部分",
    "hint": "这个场景的核心是利用插件的延时功能。想一想，消息是如何从“创建”这个时间点，过渡到“超时”这个时间点的？"
  },
  {
    "question": "以下哪个场景最不适合使用RabbitMQ延时插件来解决？",
    "options": [
      "用户下单后，若30分钟未支付，则自动关闭订单。",
      "实现一个简单的消息处理失败重试机制，每次重试间隔递增。",
      "需要实时地将股价变动信息推送给所有在线用户。",
      "在用户注册1天后，发送一封欢迎邮件。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "RabbitMQ延时插件的核心是“延迟”处理，适用于那些不需要立即执行，而是在未来某个时间点触发的异步任务。而实时股价推送要求的是极低的延迟和广播能力，这通常使用RabbitMQ的Fanout交换机来实现，与延时插件的应用场景完全相反。",
    "source": "文档中「延时插件的介绍」部分",
    "hint": "延时插件的作用是“推迟”事件的发生。哪个选项描述的场景强调的是“立即”和“实时”？"
  }
];
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        let currentQuestionIndex = 0;
        let score = 0;
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        const quizContentEl = document.getElementById('quiz-content');
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        const prevBtn = document.getElementById('prev-btn');
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        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

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          optionsListEl.innerHTML = '';
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            return;
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          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
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            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
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                    li.classList.add('selected');
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          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
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        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

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            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
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            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
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                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
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        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
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            if (currentQuestionIndex > 0) {
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                loadQuestion();
            }
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        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
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                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
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        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  